Makes me sad to hear of him being left out like that. You know he has to be lonely, but I echo the sentiments of the others in that trying to talk with the owners, calmly, about his situation would be the best thing to start with. It would be good if someone could establish if he is at least getting fed every day and fresh water. Does he look healthy?

Sure am glad he was protected during the storm. Sounds like he needs a dog house, at least, if they are feeding and giving water to him. Wonder if during the discussion, your BIL could offer to help them build one if they need it. (Wishful thinking on my part, I'm sure)

Good luck. What a tough situation. I look at my four and their spoiled selves and can't imagine treating one like that.